package com.mynetty.netty4_demos.server;

import java.nio.channels.Channels;
import java.util.Iterator;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class SimpleChatServerHandler extends SimpleChannelInboundHandler<String>{

	
	public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
	
	
	@Override
	public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
		
		Channel incoming = ctx.channel();
		for (Channel channel : channels) {
			channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + " 加入\n");
		}
		channels.add(ctx.channel());
	}
	
	@Override
	public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
		
		Channel incoming = ctx.channel();
		for (Channel channel : channels) {
			channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + " 离开\n");
		}
		channels.remove(ctx.channel());
	}
	
	@Override
	protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
		
		Channel incoming = ctx.channel();
		for (Channel channel : channels) {
			if (channel != incoming) {
				channel.writeAndFlush("[" + incoming.remoteAddress() + "]" + msg + "\n");
			}else {
				
				channel.writeAndFlush("[you]" + msg + "\n");
			}
		}
	}
	
	
	
	
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		 Channel incoming = ctx.channel();
	     System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"在线");
	}

	@Override
	public void channelInactive(ChannelHandlerContext ctx) throws Exception {
		 Channel incoming = ctx.channel();
	     System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"掉线");
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
	
		Channel incoming = ctx.channel();
	    System.out.println("SimpleChatClient:"+incoming.remoteAddress()+"异常");
        // 当出现异常就关闭连接
        cause.printStackTrace();
        ctx.close();
	}
    
	
	
}
